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Quality description for gravimetric and seismic Moho models of Fennoscandia through a combined adjustment
University West, Department of Engineering Science, Division of Natural Sciences and Electrical and Surveying Engineering. K N Toosi University of Technology, Department of Geodesy, Tehran, Iran.ORCID iD: 0000-0003-0067-8631
University of Gävle, Department of Industrial Development, IT and Land Management .
2012 (English)In: Acta Geodaetica et Geophysica Hungarica, ISSN 1217-8977, E-ISSN 1587-1037, Vol. 47, no 4, p. 388-401Article in journal (Refereed) Published
Abstract [en]

The gravimetric model of the Moho discontinuity is usually derived based on isostatic adjustment theories considering floating crust on the viscous mantle. In computation of such a model some a priori information about the density contrast between the crust and mantle and the mean Moho depth are required. Due to our poor knowledge about them they are assumed unrealistically constant. In this paper, our idea is to improve a computed gravimetric Moho model, by the Vening Meinesz-Moritz theory, using the seismic model in Fennoscandia and estimate the error of each model through a combined adjustment with variance component estimation process. Corrective surfaces of bi-linear, bi-quadratic, bi-cubic and multi-quadric radial based function are used to model the discrepancies between the models and estimating the errors of the models. Numerical studies show that in the case of using the bi-linear surface negative variance components were come out, the bi-quadratic can model the difference better and delivers errors of 2.7 km and 1.5 km for the gravimetric and seismic models, respectively. These errors are 2.1 km and 1.6 km in the case of using the bi-cubic surface and 1 km and 1.5 km when the multi-quadric radial base function is used. The combined gravimetric models will be computed based on the estimated errors and each corrective surface.

Place, publisher, year, edition, pages
2012. Vol. 47, no 4, p. 388-401
Keywords [en]
Bi-quadratic interpolation, combination, quality description, variance component estimation
National Category
Geophysics
Research subject
ENGINEERING
Identifiers
URN: urn:nbn:se:hv:diva-5306DOI: 10.1556/AGeod.47.2012.4.2ISI: 000311395800002OAI: oai:DiVA.org:hv-5306DiVA, id: diva2:617369
Available from: 2013-04-23 Created: 2013-04-23 Last updated: 2017-12-06Bibliographically approved

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Eshagh, Mehdi

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